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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>图4.14</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
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        integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
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        crossorigin="anonymous"></script>
</head>
<style>
    .container1{border: 1px solid black;background: lightgray;margin: 25px}
    .container2{border: 1px solid black;background: white;margin: 25px}
    .caption{border: 1px solid black;background: lightblue;margin: 25px}
</style>
<body>
    <div class="container">
    <!-- 搜索框 -->
    <div class="container1">
        <div class="row">
            <div class="col-lg-6">
                <div class="input-group">
                    <input type="text" class="form-control" placeholder="Search Our Website & Products">
                    <span class="input-group-btn">
                        <button class="btn btn-default" type="button">
                            <span class="glyphicon glyphicon-search" aria-hidden="true"></span>
                        </button>
                    </span>
                </div>
            </div>
        </div>
    </div>
<!-- 缩略图 -->
    <div class="container2">
        <div class="row">
            <div class="col-sm-6 col-md-4">
                <div class="thumbnail">
                    <div class="caption">
                        <h3>Sleek</h3>
                        <p>Lorern ipsum dolor sit amet,consectetur adipiscing elit.Aenean pharetra vanus maximus.Cras
                            condimentum enim a egestas.Suspendisse potenti.</p>
                        <p><a href="#" class="btn btn-primary" role="button">Read More</a> </p>
                    </div>
                </div>
            </div>
            <div class="col-sm-6 col-md-4 ">
                <div class="thumbnail">
                    <div class="caption">
                        <h3>Responsive</h3>
                        <p>Lorern ipsum dolor sit amet,consectetur adipiscing elit.Aenean pharetra vanus maximus.Cras
                            condimentum enim a egestas.Suspendisse potenti.</p>
                        <p><a href="#" class="btn btn-primary" role="button">Read More</a> </p>
                    </div>
                </div>
            </div>
            <div class="col-sm-6 col-md-4 ">
                <div class="thumbnail">
                    <div class="caption">
                        <h3>Clean</h3>
                        <p>Lorern ipsum dolor sit amet,consectetur adipiscing elit.Aenean pharetra vanus maximus.Cras
                            condimentum enim a egestas.Suspendisse potenti.</p>
                        <p><a href="#" class="btn btn-primary" role="button">Read More</a> </p>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
</body>

</html>